My 05 has the exact same problem, I have 110K miles now and it hasn't hurt anything, The local dealer replaced the drive shaft and u-joints under warranty,made no difference,they changed the pitch-angle and moved the vibration from 65 to 70,I tow at 65 ,so it really dont bother me that much now,but its still there.I don't think there is a fix for the problem.

 

As I stated earlier, my 05 had the exact same thing at the same speeds and lessoned to a very slight reverberating on and off hum at around 70mph. I found it very interesting that it disappeared AFTER I modded my trans and had an aftermarket converter and flexplate installed. Anyone else have this happen? In my case, I have to assume the stock flexplate and/or converter were possibly out of balance and the new parts were in balance. We all know Dodge uses less than high quality parts at times. Maybe this was the case for those that I replaced. Other than that, I'm sure happy I did what I did because it was annoying to either drive below or above the "vibe" mph...

 

Isn't Tims a 2WD and 47re 03.The 05 4x4 is a differant beast.The same but yet very differant.Tims has not yet had the P/S/ hose TSB done eaither.What Tim is describing I'd get that Hydro boost/p/s hose TSB done and then see.That old hose has a LOT of BUZZ to it.New updated hose made a world of differance in the smoothness of the truck.I'd hate to see someone chase the vibration/buzz feeling over a known TSB that really corrects it.I would NOT have kept my truck if that hose did not repair what I was feeling in mine.

 

Thanks for all the imput. My truck is a 4x4, I just didnt have in my sig. The vibration my truck has is definately not the P.S. hose. It may be buzzing but when this thing vibates it does just that,vibrate. I can feel it everywhere. You can also see it in the mirrors. It does change pitch by changing the amount of thottle. I almost think the rear end is whining as well. I changed the diff fluid shortly after I bought the truck. I put synthetic fluid in it with the DC adative. I filled it to the hole in the cover, I think I read on here somewhere that this is too much fluid? I guess I havent looked into it too much,guess I wouldnt think too much fluid in the diff would hurt. I know thats how I have always done it in the past. I bought the truck with 73000 mile on it. The guy that owned it was a owner or some pizza stores.All he used the truck for was driving around to his stores. I know the guy so I know hes not full of BS. All I know is this is verry annoying. I hope I can find the problem or I will be looking for another 2nd gen.

 

Have you tried removing the front driveshaft and running it like that? Some have found the front shaft way outta wack and needed balancing.

 

You'd be surprised at how much vibration comes from that hose.Not being pushy but thats why it has a TSB on it and the updated hose makes a huge differance.I could feel it in my butt cheeks through the seat and my wife could feel it in the pass side floor.Try this.In park or neautral slowly rev engine to the rpms you feel vibration while driving and beyond.Rev it slowly up and beyond that point and see if you feel anything similiar to what you feel while driving.

 

I may be wrong ,but ...I read your not to add any additive to the diff.

 

If it vibrates right at 2000 RPM, I'd bet it is the steering hose. Mine vibrated the dash enough to make it buzz, and once the TSB was done it was also notably smoother in the wheel and in the pedals.

The book says no additive for our dif, but there have been threads saying that adding the additive made things smoother. IMHO it probably wouldn't hurt anything.

Regarding level, my dealership gave me a copy of a memo saying to only fill to something like 3/4" below the fill hole, but the last time I looked at the on line TSB's it listed something different...

 

Mine started yesterday when i picked my truck up !!!!!! Its an 06 with 30k miles and has never vibrated until yesterday. Heres what they did: replaced front and rear pinion seals changed trans fluid, did the tsb on wheel hop replaced steering stab and tie rod ends. It vibrated very bad @ 65 to 70 but you can always feel it a little bit at any speed.

 

The 06 we have had a driveline vibration since the test drive ~250 miles.
I was sure I could diagnose the problem and tell the dealer how to fix it so I told them about the problem, and that it would have to be fixed and bought the truck. It does have the weight on the steering hose.
The vibration was comming through the floor, peddle, transfer shift lever, and you could even feel it in you butt through the seat.
The vibe was a pulsing, at about 0.5 Hz,(once every 2 seconds) vibration starting around 50mph up through 70mph but was not really noticable past 75mph. Truck speed dependent not engine rpm dependent.
First step was to place weights on the driveshaft in the form of hose clamps.
I placed two on the back shaft next to the pinion with the screw part (weight)of the clamps at 180° apart. I then spent the next week or so experimenting with the locations of the screws and even adding more clamps. I also indexed the shaft at the pinion by removing the 4 bolts, to all four locations with clamps(weight) on and off. Indexing made no difference but each time I added the weight back on in the same location (marked with sharpie) the vibe was minimal. I was able to get the vibe to mostly disapear.
So back to the dealer, I told them I would take the shaft out and have it balanced/straightened and send them the bill. They said the warrenty would not cover that and that they would get me a new shaft.
The new shaft came with U-joints installed on both ends with pinion flange on one end and the transfer case slip joint hollow splined shaft on the other.
Ten minutes to install, I test drove, problem solved. Absolutely no vibe could be felt. The truck had about 3000 mile on it when fixed.
I believe the original shaft was bent slightly. I would have liked to take it to a drive shaft shop for diagnosis but of course that was not happening. The splined slip part of the shaft could have been not concentric, or even the tube could have been welded in before it was centered corectly, not sure??
I have also used exhaust clamps for even more weight. Just make sure they are the right size and don't over tighten.
If you want to spend the time any problem can be fixed. Most dealers are just not going to spend the time to fix a hard to find problem.

 

Yet another person with the same problem as my buddies and they did the same exact fix. But my Buddy had driven his for so long it showed where the problem area was. The propeller shaft (splined slip part) is the main route of the problems

 

Big Dave,
Are you saying that they found that the hollow splined tube that slips into the transfercase (slip-joint) was cracked or split along the same line that the splines are cut on the inside of the slip tube?
I didn't even look at my original shaft after it was out, no vibe, I was happy and on my way. I wish I would have known to look for this.

 

I've got a 03 SO with the 48re tranny.
*Had the vibrations that started at about 60-65 got worse 70, then actually seemed to smooth out above that.
*Would vibrate as I came down in speed.
*Could not pin point exactly where it was coming from- I swear I could feel it in the seat, but also slightly in the steering wheel.
*Brought it in to the dealer and sure enough I had a bad U-joint. replaced and vibration was gone.

Just my first experience with a Vibration issue that was solved.

Kutch

 

Which U-joint? I've got the problem in my '04!

 

Farthest rear, - closest to the pumpkin.